package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.context.BaseContext;
import com.sky.dto.OrdersPageQueryDTO;
import com.sky.dto.OrdersPaymentDTO;
import com.sky.dto.OrdersSubmitDTO;
import com.sky.entity.*;
import com.sky.exception.AddressBookBusinessException;
import com.sky.exception.OrderBusinessException;
import com.sky.exception.ShoppingCartBusinessException;
import com.sky.mapper.*;
import com.sky.result.PageResult;
import com.sky.service.AddressBookService;
import com.sky.service.OrderService;
import com.sky.utils.WeChatPayUtil;
import com.sky.vo.OrderPaymentVO;
import com.sky.vo.OrderSubmitVO;
import com.sky.vo.OrderVO;
import com.sky.websocket.WebSocketServer;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.math.BigDecimal;
import java.time.LocalDateTime;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;


@Service
public class OrderServiceImpl implements OrderService {


    @Autowired
    private AddressBookService addressBookService;
    @Autowired
    private ShoppingMapper shoppingMapper;
    @Autowired
    private OrderMapper orderMapper;
    @Autowired
    private OrderDetailMapper orderDetailMapper;
    @Autowired
    private UserMapper userMapper;
    @Autowired
    private WeChatPayUtil weChatPayUtil;
    @Autowired
    private WebSocketServer webSocketServer;
    @Autowired
    private ShoppingCartMapper shoppingCartMapper;




    /**
     * 用户下单
     * @param ordersSubmitDTO
     * @return
     */
    @Transactional
    @Override
    public OrderSubmitVO subMitOrder(OrdersSubmitDTO ordersSubmitDTO) {

        // 处理逻辑异常（判断购物车和地址捕是否为空
        AddressBook addressBook = addressBookService.selectAddressBookById(ordersSubmitDTO.getAddressBookId());
        // 如果地址捕为空，就抛出异常数据
        if(addressBook == null){
            throw new AddressBookBusinessException(MessageConstant.ADDRESS_BOOK_IS_NULL);
        }

        // 判断购物车是否有数据
        Long currentId = BaseContext.getCurrentId();    // 获取当前用户的id
        List<ShoppingCart> shoppingCarts = shoppingMapper.selectShoppingByUserId(currentId);
        // 如果购物车数据为空，抛出异常
        if(shoppingCarts == null || shoppingCarts.size() == 0){
            throw new ShoppingCartBusinessException(MessageConstant.SHOPPING_CART_IS_NULL);
        }


        // 向订单表中添加一条数据
        Orders orders = new Orders();
        BeanUtils.copyProperties(ordersSubmitDTO,orders);
        orders.setOrderTime(LocalDateTime.now());                           // 下单时间
        orders.setPayStatus(Orders.UN_PAID);                                // 支付状态
        orders.setStatus(Orders.PENDING_PAYMENT);                           // 设置付款状态
        orders.setNumber(String.valueOf(System.currentTimeMillis()));       // 设置订单号
        orders.setPhone(addressBook.getPhone());                            // 设置手机号
        orders.setConsignee(addressBook.getConsignee());                    // 设置收货人
        orders.setUserId(currentId);                                        // 设置用户id
        orderMapper.insertOrder(orders);


        List<OrderDetail> orderDetailList = new ArrayList<>();
        // 向订单明细表中插入n条数据
        for (ShoppingCart shoppingCart : shoppingCarts) {
            // 创建订单明细对象
            OrderDetail orderDetail = new OrderDetail();
            BeanUtils.copyProperties(shoppingCart,orderDetail);
            // 设置订单明细关联的订单id
            orderDetail.setOrderId(orders.getId());
            orderDetailList.add(orderDetail);
        }
        // 批量插入明细数据
        orderDetailMapper.insertBeach(orderDetailList);

        // 清空用户购物车数据
        shoppingMapper.deleteShoppingByUserId(currentId);

        // 封装结果
        OrderSubmitVO orderSubmitVO = OrderSubmitVO.builder()
                .id(orders.getId())
                .orderTime(orders.getOrderTime())
                .orderNumber(orders.getNumber())
                .orderAmount(orders.getAmount())
                .build();

        return  orderSubmitVO;
    }



    /**
     * 订单支付
     * @param ordersPaymentDTO
     * @return
     */
    public OrderPaymentVO payment(OrdersPaymentDTO ordersPaymentDTO) throws Exception {
        // 当前登录用户id
        Long userId = BaseContext.getCurrentId();
        User user = userMapper.getByOpenId(userId.toString());

        //调用微信支付接口，生成预支付交易单
        JSONObject jsonObject = weChatPayUtil.pay(
                ordersPaymentDTO.getOrderNumber(), //商户订单号
                new BigDecimal(0.01), //支付金额，单位 元
                "苍穹外卖订单", //商品描述
                user.getOpenid() //微信用户的openid
        );

        if (jsonObject.getString("code") != null && jsonObject.getString("code").equals("ORDERPAID")) {
            throw new OrderBusinessException("该订单已支付");
        }

        OrderPaymentVO vo = jsonObject.toJavaObject(OrderPaymentVO.class);
        vo.setPackageStr(jsonObject.getString("package"));

        return vo;
    }

    /**
     * 支付成功，修改订单状态
     *
     * @param outTradeNo
     */
    public void paySuccess(String outTradeNo) {

        // 根据订单号查询订单
        Orders ordersDB = orderMapper.getByNumber(outTradeNo);

        // 根据订单id更新订单的状态、支付方式、支付状态、结账时间
        Orders orders = Orders.builder()
                .id(ordersDB.getId())
                .status(Orders.TO_BE_CONFIRMED)
                .payStatus(Orders.PAID)
                .checkoutTime(LocalDateTime.now())
                .build();

        orderMapper.update(orders);

        // 通过websocket推送消息
        Map map = new HashMap();
        map.put("type",1);      // 1表示提醒，2表示催单
        map.put("orderId",ordersDB.getId());    // 获取订单id
        map.put("content","订单号："+outTradeNo);
        String jsonString = JSON.toJSONString(map);
        webSocketServer.sendToAllClient(jsonString);
    }


    /**
     * 用户催单
     * @param id
     */
    @Override
    public void reminder(Long id) {
        // 根据订单号查询订单
        Orders ordersDB = orderMapper.getByNumber(String.valueOf(id));
        // 判断是否有这个订单
        if(ordersDB == null){
            throw new OrderBusinessException(MessageConstant.ORDER_STATUS_ERROR);
        }

        // 通过websocket推送消息
        Map map = new HashMap();
        map.put("type",2);      // 1表示提醒，2表示催单
        map.put("orderId",id);    // 获取订单id
        map.put("content","订单号：" + ordersDB.getNumber());
        String jsonString = JSON.toJSONString(map);
        webSocketServer.sendToAllClient(jsonString);
    }


    /**
     * 取消订单
     * @param id
     */
    @Override
    public void cancel(Long id) {
        // 根据订单号查询订单
        Orders ordersDB = orderMapper.getById(id);
        // 判断是否有这个订单
        if(ordersDB == null){
            throw new OrderBusinessException(MessageConstant.ORDER_NOT_FOUND);
        }
        Orders orders = new Orders();
        orders.setStatus(6);
        orders.setCancelTime(LocalDateTime.now());
        orderMapper.update(orders);
    }



    /**
     * 用户端订单分页查询
     * @param pageNum
     * @param pageSize
     * @param status
     * @return
     */
    public PageResult pageQuery4User(int pageNum, int pageSize, Integer status) {
        // 设置分页
        PageHelper.startPage(pageNum, pageSize);

        OrdersPageQueryDTO ordersPageQueryDTO = new OrdersPageQueryDTO();
        ordersPageQueryDTO.setUserId(BaseContext.getCurrentId());
        ordersPageQueryDTO.setStatus(status);

        // 分页条件查询
        Page<Orders> page = orderMapper.pageQuery(ordersPageQueryDTO);

        List<OrderVO> list = new ArrayList();

        // 查询出订单明细，并封装入OrderVO进行响应
        if (page != null && page.getTotal() > 0) {
            for (Orders orders : page) {
                Long orderId = orders.getId();// 订单id

                // 查询订单明细
                List<OrderDetail> orderDetails = orderDetailMapper.getByOrderId(orderId);

                OrderVO orderVO = new OrderVO();
                BeanUtils.copyProperties(orders, orderVO);
                orderVO.setOrderDetailList(orderDetails);

                list.add(orderVO);
            }
        }
        return new PageResult(page.getTotal(), list);
    }

    /**
     * 查询订单详情
     * @param id
     * @return
     */
    public OrderVO details(Long id) {
        // 根据id查询订单
        Orders orders = orderMapper.getById(id);

        // 查询该订单对应的菜品/套餐明细
        List<OrderDetail> orderDetailList = orderDetailMapper.getByOrderId(orders.getId());

        // 将该订单及其详情封装到OrderVO并返回
        OrderVO orderVO = new OrderVO();
        BeanUtils.copyProperties(orders, orderVO);
        orderVO.setOrderDetailList(orderDetailList);

        return orderVO;
    }


    /**
     * 再来一单
     * @param id
     */
    public void repetition(Long id) {
        // 查询当前用户id
        Long userId = BaseContext.getCurrentId();

        // 根据订单id查询当前订单详情
        List<OrderDetail> orderDetailList = orderDetailMapper.getByOrderId(id);

        // 将订单详情对象转换为购物车对象
        List<ShoppingCart> shoppingCartList = orderDetailList.stream().map(x -> {
            ShoppingCart shoppingCart = new ShoppingCart();

            // 将原订单详情里面的菜品信息重新复制到购物车对象中
            BeanUtils.copyProperties(x, shoppingCart, "id");
            shoppingCart.setUserId(userId);
            shoppingCart.setCreateTime(LocalDateTime.now());

            return shoppingCart;
        }).collect(Collectors.toList());

        // 将购物车对象批量添加到数据库
        shoppingCartMapper.insertBatch(shoppingCartList);
    }

}
